I've been testing the TAG Heuer Carrera Tourbillon Extreme Sport to put it through its paces. While it's not the cheapest tourbillon piece on the market, it does remain a more affordable option ...

Now, the two firms which still bear their founders’ names have come together in a partnership, launching a new timepiece as their first joint venture: the £4,850 TAG Heuer Carrera Porsche Chronograph.